本题目来源于试卷: Unity and Diversity A.1 Water，类别为 IB生物学
[单选题]
Which of the following statement(s) about the role of water a7q 9vk mjd5mw..j kv3es a solven: *pph*t*7d;e a plmynt is corrpd* 7t*pnp:e;a * mylhect?
I. Salt can dissolve in water because it is hydrophilic
II. Lipids cannot dissolve in water because they are non-polar
III. Cellulose can dissolve in water, as it is able to form hydrogen bonds
A. I only
B. I and III only
C. I and II only
D. I, II and III
参考答案: C
本题详细解析:
Salt, an ionic compound, dissolves readily in water because wat x*o9(m9d swt( wux:kxer is a polar solvent and can interact with the charged ions in salt through electrostatic attractions. Substances that have an affinity for (wdkux*t sxw:o9(m9 xwater and can form interactions with water molecules are referred to as hydrophilic (Statement I). Lipids are non-polar molecules, and water is a polar solvent. Polar and non-polar substances do not readily mix because water molecules are attracted to each other through hydrogen bonding and other dipole-dipole interactions. Lipids are hydrophobic, meaning they repel water and do not dissolve well in it (Statement II). Choice C is, therefore, correct.
Although cellulose can form hydrogen bonds, it is insoluble (Statement III) as it is too large to dissolve in water; Choices B and D are therefore incorrect as they include this statement. Choice A is incorrect as it does not include statement II.
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